This document discusses using rice husk ash (RHA) as a partial replacement for cement in concrete to create high-performance concrete. RHA is a waste product from rice production that can be used beneficially as a pozzolanic material in concrete. The document outlines that concrete with up to 15% RHA replacement achieved higher compressive strength than normal concrete. It also notes that RHA concrete requires more superplasticizers and air-entraining admixtures but can provide improved compressive strength over time compared to normal concrete. The goal of using RHA is to create stronger, more durable concrete while beneficially using an agricultural waste product.